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Flax Typhoon
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OrganisationCN

Flax Typhoon

China-based state-sponsored hacking group, targeting Taiwan first, enabled by Beijing firm Integrity Tech.

On 8 October 2026 ten agencies from seven countries tied Flax Typhoon's methods to hackers enabled by Integrity Technology Group, a for-profit Beijing company, in advisory AA26-281A, widening the known victims from Taiwan to US government and healthcare bodies.

Last refreshed: 12 October 2026 · Appears in 1 active topic

Key Question

Why did ten agencies name a Beijing company rather than Flax Typhoon itself?

Timeline for Flax Typhoon

#14 8 Oct

Ten agencies name Beijing firm in hacks

Cybersecurity: Threats and Defences
#4 14 May

UAT-8616 keeps Cisco SD-WAN under fire

Cybersecurity: Threats and Defences
#2 23 Apr
#2 23 Apr

Sixteen cyber agencies name Flax Typhoon network

Cybersecurity: Threats and Defences
View full timeline →

Background

Microsoft coined the name Flax Typhoon in August 2023 for a China-based, state-sponsored group it had watched since mid-2021. Its first report described intrusions into Taiwanese government, education, manufacturing and technology organisations that relied on legitimate software such as SoftEther VPN rather than custom malware. Other security firms track the same activity as ETHEREAL PANDA and RedJuliett, and Recorded Future treats RedJuliett as a close overlap rather than an exact match.

In September 2024 the FBI and its partners said Integrity Technology Group controlled a botnet of more than 260,000 compromised routers, cameras and storage devices that Flax Typhoon used. Sanctions on the company followed from the US Treasury on 3 January 2025, the UK on 9 December 2025 and the EU in March 2026; the EU Council said Flax Typhoon had reached devices in six member states.

Flax Typhoon's covert relay networks also surface in other campaigns. US authorities said in May 2026 that UAT-8616, a China-linked group exploiting a maximum-severity Cisco SD-WAN flaw, used tools tied to the same relay infrastructure.

Key Issues
Allied attribution

Allies trace the group through a contractor

Western and Asian governments have twice in 2026 put Flax Typhoon at the centre of a joint warning. On 23 April sixteen national agencies named the group and Integrity Tech as operators of more than 200,000 hijacked home routers, and conceded that blocklists of hacker addresses age faster than defenders can refresh them.

AA26-281A followed on 8 October with the FBI, NSA, CISA and Britain's NCSC among its ten signatories. It listed US government, healthcare and IT victims plus email theft in Southeast Asia, and Japan's police traced linked indicators to January 2016. CISA gave federal bodies until 11 October to fix five exploited flaws dating from 2015 to 2023. Naming the supplier signals the allies' view that Beijing's hacking runs through commercial firms.

Common Questions
How does Flax Typhoon avoid detection?
Flax Typhoon routes its traffic through a botnet of compromised end-of-life SOHO routers, cameras, and firewalls called Raptor Train. Because these devices cannot be patched and are cycled quickly, indicators of compromise disappear almost as fast as defenders publish them, a pattern the 16-agency advisory called 'IOC extinction'. This makes blocklists structurally insufficient against this actor.Source: NCSC 16-agency joint advisory, April 2026
What is the connection between Flax Typhoon and Integrity Technology Group?
The FBI said in September 2024 that Integrity Tech controlled a botnet Flax Typhoon used. Advisory AA26-281A of 8 October 2026 says hackers enabled by the company use methods consistent with Flax Typhoon.Source: FBI advisory, 18 September 2024; CISA advisory AA26-281A
When was Flax Typhoon first publicly disclosed?
Microsoft first named Flax Typhoon in August 2023, saying it had been active since mid-2021 and mainly targeted organisations in Taiwan.Source: Microsoft Threat Intelligence, 24 August 2023
Is UAT-8616 part of Flax Typhoon?
UAT-8616 is not formally attributed to Flax Typhoon. CISA's Emergency Directive on Cisco SD-WAN CVE-2026-20182 documented that UAT-8616's ORB infrastructure overlaps with Flax Typhoon and Integrity Technology Group networks, but whether UAT-8616 is a sub-cluster, a distinct actor, or an infrastructure sharer remains publicly unresolved.Source: CISA ED 26-03
Is Flax Typhoon the same as RedJuliett?
Largely. Recorded Future says RedJuliett closely overlaps with Flax Typhoon and ETHEREAL PANDA, and US-led advisories list all three names, while warning vendor tracking may not map exactly.Source: Recorded Future; CISA advisory AA26-281A
Who does Flax Typhoon target?
Microsoft found it mainly targeting Taiwanese government, education, manufacturing and IT bodies. AA26-281A adds US government, healthcare and IT victims and email theft in Southeast Asia.Source: Microsoft, August 2023; CISA advisory AA26-281A
Source Material